Hello,
Welcome to the HP Support forum. Welcome to the English speaking community.
Note, that if you prefer speaking in German, HP has German forum with German speaking community > http://h30492.www3.hp.com/
With regards to your issue:
I am afraid your PC does not officially support Windows 10. Supported are XP, Vista, 7 and 8/8.1 - but not Windows 10.
HP hasn't officially released drivers for Win 10, hasn't officially tested Windows 10 on this PC and variety of issues may occur.
It is recommended that you run either Windows 7 SP1 or Windows 8.1 (both are stable and supported by the vendor - Microsoft)
Hope this helps. Let me know how it goes.
Tschüss 🙂
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*** HP employee *** I express personal opinion only *** Joined the Community in 2013